CN110299389B - Organic light emitting display device - Google Patents
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- CN110299389B CN110299389B CN201910559649.XA CN201910559649A CN110299389B CN 110299389 B CN110299389 B CN 110299389B CN 201910559649 A CN201910559649 A CN 201910559649A CN 110299389 B CN110299389 B CN 110299389B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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Abstract
The invention provides an organic light emitting display device, comprising a plurality of organic light emitting units; each organic light-emitting unit comprises a lower electrode arranged on the substrate, an organic light-emitting layer arranged on the lower electrode, and an upper electrode arranged on the organic light-emitting layer; the lower electrode comprises a lower electrode first part and a lower electrode second part which are arranged in a stacked mode; the lower electrode first part is arranged on the substrate, and the included angle between the two inner side edges of the lower electrode first part and the substrate is more than or equal to 90 degrees; the lower electrode second part is arranged on the lower electrode first part, and an included angle between two inner side edges of the lower electrode second part and the top surface of the lower electrode first part is less than 90 degrees; the organic light-emitting diode further comprises a pixel defining layer which is arranged among the plurality of organic light-emitting units and covers the side edge of the lower electrode, and the pixel defining layer is formed into a film according to the shape of the side edge of the lower electrode; the organic light emitting layers of the plurality of organic light emitting units include a plurality of organic film layers, at least a portion of which are broken at the pixel defining layer.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to an organic light-emitting display device.
Background
The organic light emitting display device has a problem of crosstalk between adjacent pixel units. As shown in fig. 1, which is a schematic diagram of an organic light emitting display device in the prior art, the organic light emitting display device includes a substrate 10, a plurality of pixel units are disposed on the substrate 10, and two pixel units U1 and U2 are shown. Each pixel unit comprises an anode 11 arranged on the substrate 10, and a pixel defining layer 12 arranged on the anode 11 and between the pixel units U1 and U2, wherein the pixel defining layer 12 is in a gradual slope shape due to an etching process. A hole injection layer 13, a hole transport layer 14, and an electron blocking layer 15 formed on the pixel defining layer 12, and the hole injection layer 13, the hole transport layer 14, and the electron blocking layer 15 are all of a connection structure in which the pixel unit regions are connected to one another. An organic light emitting layer 19 disposed in each pixel unit region, a hole blocking layer 16 disposed on the organic light emitting layer 19, an electron transport layer 17 disposed on the hole blocking layer 16, a cathode 18 disposed on the electron transport layer 17, and the cathode 18 are connected in each pixel unit region. In the structure of the organic light emitting display device shown in fig. 1, display crosstalk between the pixel units U1 and U2 occurs, that is, when the pixel unit U1 has a display signal, a part of the display current is transmitted to the pixel unit U2 due to the film layer with high carrier mobility in the film layer of the continuous structure, so that the pixel unit U2 cannot display a predetermined pixel gray scale, which greatly affects the display effect of the organic light emitting display device.
In the prior art, a pixel defining layer is designed to have a multi-layer structure or an anode is designed to have a chamfered structure, and a film layer with high carrier mobility is cut off to suppress the above-mentioned poor crosstalk, as disclosed in patent No. CN103781215, please refer to fig. 2, and fig. 2 is a schematic diagram of an organic light emitting display device provided in patent No. CN 103781215. As shown, the pixel defining layer includes a first portion 150 and a second portion 155 disposed on the first portion 150, with a gap 156 disposed between the first portion 150 and the second portion 155. The organic light emitting layer 120 is provided to be disconnected at the gap 156 to block cross-talk between pixel units. Fig. 3 is a schematic diagram of an organic light-emitting display device provided in publication No. CN 103891408. As shown, the anode 31 has a chamfer 31A, and the organic light emitting layer 32A may be disconnected at the anode chamfer 31A to block crosstalk between pixel units.
The above-described structures all have significant disadvantages. The first is the complexity of the process. The pixel defining layer is used for separating pixel units and is generally formed by a single-layer structure, the pixel defining layer in the structure shown in fig. 2 needs two or more layers, and each layer needs to be formed by independent film forming, so that the process steps are increased. Second, light leakage may occur. As shown in fig. 3, the organic light-emitting layer 32A is not necessarily broken at the anode chamfer 31A, and an extremely thin continuous film layer is likely to be formed. Since the thin resistance of the organic film 32A at the chamfer 31A is small, a current path with small resistance is formed between the anode 31 and the cathode 33 at the area a in fig. 3, so that the current is not transmitted laterally, but transmitted from the anode 31, the organic light emitting layer 32A to the cathode 122 at the area a, and light leakage occurs at the area a in the figure.
Disclosure of Invention
In view of the above, the present invention provides an organic light emitting display device including a plurality of organic light emitting units; each organic light-emitting unit comprises a lower electrode arranged on a substrate, an organic light-emitting layer arranged on the lower electrode, and an upper electrode arranged on the organic light-emitting layer;
the lower electrode comprises a lower electrode first part and a lower electrode second part which are stacked; the lower electrode first part is arranged on the substrate, and an included angle between two inner side edges of the lower electrode first part and the substrate is more than or equal to 90 degrees; the lower electrode second part is arranged on the lower electrode first part, and the included angle between the two inner side edges of the lower electrode second part and the top surface of the lower electrode first part is less than 90 degrees;
the pixel definition layer comprises a pixel definition layer first part covering the side edge of the lower electrode first part and a pixel definition layer second part covering the side edge of the lower electrode second part; an included angle between the first part of the pixel definition layer and the substrate is more than or equal to 90 degrees; the included angle between the second part of the pixel definition layer and the top surface of the first part of the lower electrode is less than 90 degrees;
the organic light emitting layers of the plurality of organic light emitting units include a plurality of organic film layers, at least a portion of which are disconnected at the pixel defining layer.
Optionally, an included angle between two inner side edges of the first portion of the lower electrode and the substrate is greater than 135 degrees and less than or equal to 150 degrees.
Optionally, an included angle between two inner side edges of the second lower electrode portion and the top surface of the first lower electrode portion is greater than or equal to 30 degrees and less than or equal to 60 degrees.
Optionally, the lower electrode further comprises a third lower electrode portion disposed below the first lower electrode portion.
Optionally, the lower electrode further comprises a third lower electrode portion disposed above the second lower electrode portion.
Optionally, the organic light emitting layer includes a first organic film layer stacked, a second organic film layer stacked on the first organic film layer; the first organic film layer is disconnected at the pixel defining layer.
Optionally, the thickness of the first organic film layer is less than or equal to the thickness of the first portion of the lower electrode; the sum of the thicknesses of the first and second organic film layers is greater than the thickness of the first portion of the lower electrode.
Alternatively, the upper electrodes of the plurality of organic light emitting cells are connected to each other.
Optionally, the first organic film layer includes a hole injection layer and a hole transport layer, which are sequentially stacked; the second organic film layer comprises an electron blocking layer, an organic light-emitting material layer, a hole blocking layer and an electron transmission layer which are sequentially stacked.
Optionally, the first organic film layer includes a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first organic light emitting material layer, a first hole blocking layer, a charge generation layer, a second hole injection layer, and a second hole transport layer, which are sequentially stacked; the second organic film layer comprises a second electron blocking layer, a second organic light-emitting material layer, a second hole blocking layer and an electron transmission layer which are sequentially stacked.
Optionally, the organic light emitting display device is a silicon-based micro organic light emitting display device.
The organic light-emitting display device provided by the invention has the advantages that the lower electrode is of a common structure in the organic light-emitting display device, the number of lower electrode film layers and the corresponding film forming process are not required to be increased on the basis of the prior art, the pixel defining layer is formed by the lower electrodes of the two-layer or multi-layer structure according to the shape of the lower electrodes, the effect of cutting off part of the organic film layers and preventing crosstalk between pixel units can be achieved, and the process is simplified compared with the pixel defining layer formed by film forming and etching for multiple times. In addition, at the pixel defining layer, if some film layers in the organic film layer are not completely disconnected, an extremely thin continuous film layer is formed, but because the pixel defining layer separates the organic film layer from the lower electrode, a current path with small resistance cannot be formed between the lower electrode and the upper electrode, so that the condition of light leakage cannot occur, and the display effect of the organic light-emitting display device is improved.
Drawings
FIG. 1 is a schematic diagram of an organic light emitting display device according to the prior art;
FIG. 2 is a schematic view of another organic light emitting display device in the prior art;
FIG. 3 is a schematic view of yet another prior art organic light emitting display device;
FIG. 4 is a schematic view of an organic light emitting display device according to an embodiment of the present invention;
fig. 5 and 6 are schematic views of a pixel defining layer forming method;
fig. 7 to 10 are schematic structural diagrams of lower electrodes in several embodiments.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 4, a schematic diagram of an organic light emitting display device according to an embodiment of the present invention is shown, in which an organic light emitting display device 20 includes a plurality of organic light emitting units 21; each organic light emitting unit 21 includes a lower electrode 23 disposed on the substrate 22, an organic light emitting layer 24 disposed on the lower electrode, and an upper electrode 25 disposed on the organic light emitting layer 24. Alternatively, the lower electrode 23 is an anode and the upper electrode 25 is a cathode.
The lower electrode 23 includes a lower electrode first portion 231 and a lower electrode second portion 232 which are stacked. The lower electrode first portion 231 is disposed on the substrate 22, and an included angle α 1 between two inner edges of the lower electrode first portion 231 and the substrate 22 is greater than or equal to 90 degrees. The lower electrode second portion 232 is disposed on the lower electrode first portion 231, and an included angle α 2 between two inner edges of the lower electrode second portion 232 and a top surface of the lower electrode first portion 231 is smaller than 90 degrees.
The organic light emitting display device 20 further includes a pixel defining layer 26 disposed between the plurality of organic light emitting units 21, the pixel defining layer 26 being formed in a shape of a side of the lower electrode 23 and covering the side of the lower electrode 23. Specifically, the pixel definition layer includes a pixel definition layer first portion 261 covering a side edge of the lower electrode first portion 231, and a pixel definition layer second portion 262 covering a side edge of the lower electrode second portion 232. According to the shape of the side of the lower electrode 23, the included angle α 1 between the first portion 261 of the pixel defining layer and the substrate 22 is greater than or equal to 90 degrees, and the included angle α 2 between the second portion 262 of the pixel defining layer and the top surface of the first portion 231 of the lower electrode is less than 90 degrees.
As shown in fig. 5 and 6, a schematic diagram of a pixel definition layer forming method is shown. The pixel defining layer is formed after the lower electrode 23 is formed. First, a deposition film of a pixel defining layer is formed on the upper layer of the lower electrode 23, the pixel defining layer is generally formed by a chemical vapor deposition process, a film forming material is introduced into the reaction chamber in a gaseous state, and then a chemical reaction occurs between the materials to deposit on the upper layer of the lower electrode 23, so that the pixel defining layer 260 covering the side edge of the lower electrode 23 and having a shape identical to the side edge thereof can be formed. The pixel defining layer 260 has a whole-layer structure, the pixel defining layer 260 includes a first pixel defining layer portion 261 covering a side edge of the first lower electrode portion 231, a first pixel defining layer portion 262 covering a side edge of the second lower electrode portion 232, and the pixel defining layer 260 further includes a top surface portion covering the lower electrodes 23 and a portion of the substrate 22 covering a space region between two adjacent lower electrodes 23.
Then, a photoresist layer is formed on the entire pixel defining layer 260, and the photoresist layer is exposed and developed to form a patterned photoresist layer 27, wherein the patterned photoresist layer 27 exposes the top surface of the lower electrode 23 and shields other positions. The pixel defining layer 260 is etched using the patterned photoresist layer 27 as a mask, the pixel defining layer 260 on the top surface of the lower electrode 23 is removed, and then the patterned photoresist layer 27 is removed. The etched pixel definition layer 260 includes a first pixel definition layer portion 261 covering a side edge of the first lower electrode portion 231, a second pixel definition layer portion 262 covering a side edge of the second lower electrode portion 232, and a third pixel definition layer portion 263 covering a space region between two adjacent lower electrodes 23.
Referring to fig. 4, an organic light emitting layer 24 is formed on the pixel defining layer after the etching is completed. The organic light emitting layer 24 includes a plurality of organic film layers, wherein at least a portion of the organic film layers are disconnected at the pixel defining layer.
The same organic film layer of the plurality of organic light emitting units 21 of the organic light emitting display device 20 is formed in the same evaporation process using an open mask, which only covers the peripheral region of the display device, exposing the plurality of organic light emitting unit regions and the spacing region of the display region. In the evaporation process, the organic film material is first heated and vaporized, and the vaporized organic film material is diffused and adhered to the substrate 22. Since the vaporized organic film material has low energy and poor film coverage, when it is diffused to the pixel defining layer first portion 261 and the pixel defining layer second portion 262, the organic film material cannot be continuously attached to the pixel defining layer first portion 261 and the pixel defining layer second portion 262 because the pixel defining layer second portion 262 shields the pixel defining layer first portion 261, and thus a disconnected structure is formed.
In the embodiment of the present invention, the lower electrode 23 is configured in the shape as described above, so that the pixel defining layer 26 is also formed in accordance with the shape of the side surface of the lower electrode 23, and the organic film layer formed on the pixel defining layer 26 is disconnected at the pixel defining layer, thereby eliminating crosstalk between adjacent organic light emitting units 21.
Optionally, an included angle α 1 between two inner edges of the first lower electrode 231 and the substrate 22 is greater than 135 degrees and less than or equal to 150 degrees. An included angle α 2 between the two inner edges of the second lower electrode portion 232 and the top surface of the first lower electrode portion 231 is not less than 30 degrees and not more than 60 degrees. The pixel defining layer is formed in accordance with the shape of the lower electrode, and an angle α 1 between the first portion 261 of the pixel defining layer and the substrate 22 is also greater than 135 degrees and not greater than 150 degrees. The included angle α 2 between the second portion 262 of the pixel defining layer and the top surface of the first portion 231 of the lower electrode is also greater than or equal to 30 degrees and less than or equal to 60 degrees, which is easier to control in the above-mentioned process and has good process stability.
In the present invention, the lower electrode has a two-layer structure, and the two-layer structure or the multi-layer structure of the lower electrode is a common structure in the organic light emitting display device.
Alternatively, the lower electrode first portion 231 is a contact electrode layer for enhancing the contact strength between the electrode and the substrate 22, it should be noted that the substrate 22 also includes a substrate on which other film layers have been deposited, and the lower electrode first portion 231 may be a material for enhancing the contact strength between the electrode and other material layers on the substrate 22. The material of the lower electrode first portion 231 is at least one metal selected from the group consisting of silver, neodymium, chromium, indium, tin, zinc, cadmium, titanium, aluminum, magnesium, and molybdenum. The lower electrode second portion 232 is a conductive metal layer with high conductivity.
Alternatively, the organic light emitting unit 21 is a microcavity structure organic light emitting unit, the lower electrode 23 includes a reflective material, the upper electrode 25 includes a transflective material, and a resonant cavity is formed between the lower electrode 23 and the upper electrode 25. The lower electrode first portion 231 is a reflective metal layer, such as silver or an alloy containing silver. The lower electrode second portion 232 is an optical adjustment layer formed of a transparent conductive metal, for example, the material of the lower electrode second portion 232 may be indium tin oxide or indium zinc oxide.
Because the lower electrode has a two-layer structure or a multi-layer structure in the organic light-emitting display device, the number of lower electrode film layers and a corresponding film forming process do not need to be increased on the basis of the prior art, and the lower electrode with the two-layer or multi-layer structure can be used for breaking part of the organic film layers and preventing crosstalk between pixel units only by forming the pixel defining layer according to the shape of the lower electrode. In addition, as shown in fig. 4, if some of the organic film layers 24 are not completely broken at the pixel defining layer, an extremely thin continuous film layer is formed, but since the organic film layer 24 and the lower electrode 23 are separated by the pixel defining layer, a current path with a small resistance is not formed from the lower electrode to the upper electrode, and thus light leakage does not occur at the region a, and the display effect of the organic light emitting display device is improved.
Alternatively, the lower electrode may have a structure different from that shown in fig. 4, please refer to fig. 7 to fig. 10, which are schematic structural diagrams of the lower electrode in several embodiments.
Fig. 7 is a schematic structural diagram of a lower electrode in an embodiment, and in fig. 7, a width of a top surface of the first portion 231 of the lower electrode is smaller than a width of a bottom surface of the second portion 232 of the lower electrode, and as long as an angle between the first portion 231 of the lower electrode and the second portion 232 of the lower electrode meets a requirement, a relationship between the widths of the first portion 231 of the lower electrode and the second portion 232 of the lower electrode is not limited.
Fig. 8 is a schematic structural diagram of a lower electrode in a further embodiment, and fig. 9 is a schematic structural diagram of a lower electrode in a third embodiment, wherein the lower electrode further includes a third lower electrode portion 233 located below the first lower electrode portion 231. The lower electrode third portion 233 is formed of a third conductive film layer different from the lower electrode first portion 231 and the lower electrode second portion 232. In fig. 8, the angle between the side and bottom surfaces of the third portion 233 of the lower electrode is less than 90 degrees. In fig. 9, the angle between the side edge and the bottom surface of the third portion 233 of the lower electrode is greater than 90 degrees. The structure of the lower electrode third portion 233 may be various, and for example, may be arranged such that the side edges thereof are perpendicular to the bottom surface. Fig. 8 and 9 schematically illustrate two types of electrodes, but the present invention is not limited to these two types of structures, and the lower electrode third portion 233 may have any structure without affecting the structures of the lower electrode first portion 231 and the lower electrode second portion 232.
Fig. 10 is a schematic structural diagram of the lower electrode in the fourth embodiment, and the lower electrode further includes a third portion 233 of the lower electrode above the second portion 232 of the lower electrode. The lower electrode third portion 233 is formed of a third conductive film layer different from the lower electrode first portion 231 and the lower electrode second portion 232. Preferably, when the third lower electrode portion 233 is located above the second lower electrode portion 232, the width of the bottom surface of the third lower electrode portion 233 is less than or equal to the width of the top surface of the second lower electrode portion 232, an included angle between the side surface and the bottom surface of the third lower electrode portion 233 is less than 90 degrees, and the side surface of the third lower electrode portion 233 is of a gradually-sloped structure, which is beneficial to forming a continuous film layer when an upper electrode located thereon is formed.
The organic light-emitting layer 24 has a structure in which a plurality of film layers are stacked, and it is only necessary to disconnect a film layer having high carrier mobility, which is likely to cause lateral leakage, among the plurality of film layers between the pixel units. Specifically, as shown in fig. 4, the organic light emitting layer 24 may include a first organic film 241, and a second organic film 242 disposed on the first organic film 241. The first organic film 241 includes an organic film having a high carrier mobility and easily performing lateral conduction, and the second organic film 242 has a low carrier mobility and is not easily performed lateral conduction. The first organic film 241 is only required to be disconnected between the pixel units, and the second organic film 242 is ensured to be a continuous structure between the pixel units, so that the upper electrode 25 formed on the second organic film 242 can also be formed on the second organic film 242 with the continuous structure, and the transmission of the upper electrode signal between each pixel unit is ensured.
Alternatively, the thickness of the first organic film 241 is set to be equal to or less than the thickness of the lower electrode first portion 231, and the first organic film 241 is disconnected at the pixel defining layer 26. The thickness sum of the first organic film 241 and the second organic film 242 is larger than the thickness sum of the first lower electrode 231, and meanwhile, because the included angle α 2 between the two inner side edges of the second lower electrode 232 and the top surface of the first lower electrode 231 is smaller than 90 degrees, the second pixel defining layer 262 also forms a structure with the included angle α 2 between the two inner side edges of the first lower electrode 232 and the top surface of the first lower electrode 231 and smaller than 90 degrees according to the shape of the side edge of the second lower electrode 232, namely, the second pixel defining layer 262 forms a gentle slope, and when each film in the second organic film 242 is formed on the gentle slope, a continuous film structure can be formed.
Alternatively, the first organic film layer 241 may include a hole injection layer and a hole transport layer sequentially stacked. The hole injection layer and the hole transport layer have a disconnected structure because carrier mobility is high and lateral leakage between pixel units is likely to occur. The second organic film 242 on the hole injection layer and the hole transport layer includes other films having low carrier mobility and not required to be disconnected between pixel units. For example, the second organic film 242 includes an electron blocking layer, an organic light emitting material layer, a hole blocking layer, an electron transport layer, and the like, which are sequentially stacked.
Alternatively, the organic light emitting display unit includes two stacked organic light emitting units, each including a film layer having a relatively high carrier mobility, which needs to be disconnected between pixel units. For example, the first organic film layer includes a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first organic light emitting material layer, a first hole blocking layer, a charge generation layer, a second hole injection layer, and a second hole transport layer, which are sequentially stacked. The second organic film layer comprises a second electron blocking layer, a second organic light-emitting material layer, a second hole blocking layer and an electron transmission layer which are sequentially stacked.
Optionally, the organic light emitting display device provided by the embodiment of the invention is a silicon-based micro organic light emitting display device. The silicon-based micro organic light-emitting display device takes a monocrystalline silicon chip as a substrate, the pixel size is 1/10 of the traditional display device, the fineness is far higher than that of the traditional device, and the silicon-based micro organic light-emitting display device can be used for forming a micro display. The silicon-based micro organic light-emitting display device has wide market application space, and is particularly suitable for helmet displays, stereoscopic display mirrors, glasses type displays and the like. The silicon-based micro organic light-emitting display device has small pixel size, and each film layer of the organic light-emitting layer is easier to display crosstalk, so the structure provided by the embodiment of the invention is more suitable for the silicon-based micro organic light-emitting display device, and the display effect of the silicon-based micro organic light-emitting display device can be improved.
The organic light-emitting display device provided by the invention has the advantages that the lower electrode is of a common structure in the organic light-emitting display device, the number of lower electrode film layers and the corresponding film forming process are not required to be increased on the basis of the prior art, the pixel defining layer is formed by the lower electrodes of the two-layer or multi-layer structure according to the shape of the lower electrodes, the effect of cutting off part of the organic film layers and preventing crosstalk between pixel units can be achieved, and the process is simplified compared with the pixel defining layer formed by film forming and etching for multiple times. In addition, at the pixel defining layer, if some film layers in the organic film layer are not completely disconnected, an extremely thin continuous film layer is formed, but because the pixel defining layer separates the organic film layer from the lower electrode, a current path with small resistance cannot be formed between the lower electrode and the upper electrode, so that the condition of light leakage cannot occur, and the display effect of the organic light-emitting display device is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. An organic light emitting display device, comprising a plurality of organic light emitting units; each organic light-emitting unit comprises a lower electrode arranged on a substrate, an organic light-emitting layer arranged on the lower electrode, and an upper electrode arranged on the organic light-emitting layer;
the lower electrode comprises a lower electrode first part and a lower electrode second part which are stacked; the lower electrode first part is arranged on the substrate, and an included angle between two inner side edges of the lower electrode first part and the substrate is more than or equal to 90 degrees; the lower electrode second part is arranged on the lower electrode first part, and the included angle between the two inner side edges of the lower electrode second part and the top surface of the lower electrode first part is less than 90 degrees;
the pixel definition layer comprises a pixel definition layer first part covering the side edge of the lower electrode first part and a pixel definition layer second part covering the side edge of the lower electrode second part; an included angle between the first part of the pixel definition layer and the substrate is more than or equal to 90 degrees; the included angle between the second part of the pixel definition layer and the top surface of the first part of the lower electrode is less than 90 degrees;
the organic light emitting layers of the plurality of organic light emitting units include a plurality of organic film layers, at least a portion of which are disconnected at the pixel defining layer.
2. The organic light emitting display device of claim 1, wherein an angle between two inner edges of the first portion of the lower electrode and the substrate is greater than 135 degrees and not greater than 150 degrees.
3. The organic light emitting display device according to claim 1, wherein an angle between both inner side edges of the second portion of the lower electrode and the top surface of the first portion of the lower electrode is not less than 30 degrees and not more than 60 degrees.
4. The organic light emitting display device of claim 1, wherein the lower electrode further comprises a third portion of the lower electrode disposed below the first portion of the lower electrode.
5. The organic light emitting display device of claim 1, wherein the lower electrode further comprises a third portion of the lower electrode disposed over the second portion of the lower electrode.
6. The organic light emitting display device according to claim 1, wherein the organic light emitting layer comprises a first organic film layer stacked, a second organic film layer stacked disposed on the first organic film layer; the first organic film layer is disconnected at the pixel defining layer.
7. The organic light emitting display device according to claim 6, wherein a thickness of the first organic film layer is equal to or less than a thickness of the first portion of the lower electrode; the sum of the thicknesses of the first and second organic film layers is greater than the thickness of the first portion of the lower electrode.
8. The organic light emitting display device according to claim 7, wherein upper electrodes of the plurality of organic light emitting cells are connected to each other.
9. The organic light emitting display device according to claim 7,
the first organic film layer comprises a hole injection layer and a hole transport layer which are sequentially stacked;
the second organic film layer comprises an electron blocking layer, an organic light-emitting material layer, a hole blocking layer and an electron transmission layer which are sequentially stacked.
10. The organic light-emitting display device according to claim 7, wherein the first organic film layer comprises a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first organic light-emitting material layer, a first hole blocking layer, a charge generation layer, a second hole injection layer, and a second hole transport layer, which are sequentially stacked;
the second organic film layer comprises a second electron blocking layer, a second organic light-emitting material layer, a second hole blocking layer and an electron transmission layer which are sequentially stacked.
11. The organic light emitting display device according to claim 1, wherein the organic light emitting display device is a silicon-based micro organic light emitting display device.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004319143A (en) * | 2003-04-11 | 2004-11-11 | Fuji Electric Holdings Co Ltd | Organic el display and its manufacturing method |
| CN1738495A (en) * | 2004-06-25 | 2006-02-22 | 奇美电子股份有限公司 | Organic electroluminescent display panel and production method thereof |
| CN102637829A (en) * | 2011-02-11 | 2012-08-15 | 株式会社半导体能源研究所 | Light-emitting device and display device |
| CN103891408A (en) * | 2011-10-19 | 2014-06-25 | 索尼公司 | Display panel, display device, and electronic apparatus |
| CN105590956A (en) * | 2011-03-30 | 2016-05-18 | 索尼公司 | Organic light emitting device and display unit including the same |
| CN106601768A (en) * | 2016-12-22 | 2017-04-26 | Tcl集团股份有限公司 | Transparent display device and preparation method therefor |
| CN108258140A (en) * | 2016-12-29 | 2018-07-06 | 乐金显示有限公司 | Organic light emitting apparatus |
| CN108899349A (en) * | 2018-07-12 | 2018-11-27 | 京东方科技集团股份有限公司 | Display panel and its manufacturing method and display device |
| CN109390376A (en) * | 2017-08-04 | 2019-02-26 | 佳能株式会社 | Show equipment and its manufacturing method and electronic device |
| CN208797004U (en) * | 2018-09-25 | 2019-04-26 | 合肥视涯显示科技有限公司 | A kind of organic light-emitting display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928497B (en) * | 2014-04-01 | 2016-07-13 | 京东方科技集团股份有限公司 | OLED display device and preparation method thereof, display device |
| JP2019067654A (en) * | 2017-10-02 | 2019-04-25 | 株式会社ジャパンディスプレイ | Display device |
| CN108336116B (en) * | 2018-02-08 | 2022-03-08 | 京东方科技集团股份有限公司 | OLED array substrate, preparation method thereof and display device |
| CN109742112B (en) * | 2019-01-08 | 2021-10-12 | 京东方科技集团股份有限公司 | OLED display panel and electronic equipment |
-
2019
- 2019-06-26 CN CN201910559649.XA patent/CN110299389B/en active Active
- 2019-07-19 WO PCT/CN2019/096790 patent/WO2020258418A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004319143A (en) * | 2003-04-11 | 2004-11-11 | Fuji Electric Holdings Co Ltd | Organic el display and its manufacturing method |
| CN1738495A (en) * | 2004-06-25 | 2006-02-22 | 奇美电子股份有限公司 | Organic electroluminescent display panel and production method thereof |
| CN102637829A (en) * | 2011-02-11 | 2012-08-15 | 株式会社半导体能源研究所 | Light-emitting device and display device |
| CN105590956A (en) * | 2011-03-30 | 2016-05-18 | 索尼公司 | Organic light emitting device and display unit including the same |
| CN103891408A (en) * | 2011-10-19 | 2014-06-25 | 索尼公司 | Display panel, display device, and electronic apparatus |
| CN106601768A (en) * | 2016-12-22 | 2017-04-26 | Tcl集团股份有限公司 | Transparent display device and preparation method therefor |
| CN108258140A (en) * | 2016-12-29 | 2018-07-06 | 乐金显示有限公司 | Organic light emitting apparatus |
| CN109390376A (en) * | 2017-08-04 | 2019-02-26 | 佳能株式会社 | Show equipment and its manufacturing method and electronic device |
| CN108899349A (en) * | 2018-07-12 | 2018-11-27 | 京东方科技集团股份有限公司 | Display panel and its manufacturing method and display device |
| CN208797004U (en) * | 2018-09-25 | 2019-04-26 | 合肥视涯显示科技有限公司 | A kind of organic light-emitting display device |
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|---|---|
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